struts2配置log

Struts2初始化时，首先就会初始化log，看源码如下：

 1 public void init(FilterConfig filterConfig) throws ServletException {
 2         InitOperations init = new InitOperations();
 3         Dispatcher dispatcher = null;
 4         try {
 5             FilterHostConfig config = new FilterHostConfig(filterConfig);
 6             init.initLogging(config);//初始化log
 7             dispatcher = init.initDispatcher(config);
 8             init.initStaticContentLoader(config, dispatcher);
 9
10             prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
11             execute = new ExecuteOperations(filterConfig.getServletContext(), dispatcher);
12             this.excludedPatterns = init.buildExcludedPatternsList(dispatcher);
13
14             postInit(dispatcher, filterConfig);
15         } finally {
16             if (dispatcher != null) {
17                 dispatcher.cleanUpAfterInit();
18             }
19             init.cleanup();
20         }
21     }

 1 public void initLogging( HostConfig filterConfig ) {
 2         String factoryName = filterConfig.getInitParameter("loggerFactory");
 3         if (factoryName != null) {
 4             try {
 5                 Class cls = ClassLoaderUtil.loadClass(factoryName, this.getClass());
 6                 LoggerFactory fac = (LoggerFactory) cls.newInstance();//必须是LoggerFactory的子类
 7                 LoggerFactory.setLoggerFactory(fac);
 8             } catch ( InstantiationException e ) {
 9                 System.err.println("Unable to instantiate logger factory: " + factoryName + ", using default");
10                 e.printStackTrace();
11             } catch ( IllegalAccessException e ) {
12                 System.err.println("Unable to access logger factory: " + factoryName + ", using default");
13                 e.printStackTrace();
14             } catch ( ClassNotFoundException e ) {
15                 System.err.println("Unable to locate logger factory class: " + factoryName + ", using default");
16                 e.printStackTrace();
17             }
18         }
19     }

在web.xml中可以配置此log:

 1 <filter>
 2
 3         <filter-name>struts2</filter-name>
 4
 5         <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
 6
 7         <init-param>
 8             <param-name>loggerFactory</param-name>
 9             <param-value>com.opensymphony.xwork2.util.logging.commons.CommonsLoggerFactory</param-value>
10         </init-param>
11
12     </filter>

具体使用方法：

1     public static void test01() {
2         Logger log = LoggerFactory.getLogger(Test.class);
3         //必须是#加上数字的形式
4         log.info("#0t#1e#2st#3#4#5#6#7#8#9#10", new String[]{"a","b","c","d","e","f","g","h","i","j","k"});
5         log.error("#0t#1e#2st#3#4#5#6#7#8#9#10", new String[]{"a","b","c","d","e","f","g","h","i","j","k"});
6         log.warn("#0t#1e#2st#3#4#5#6#7#8#9#10", new String[]{"a","b","c","d","e","f","g","h","i","j","k"});
7         log.fatal("#0t#1e#2st#3#4#5#6#7#8#9#10", new String[]{"a","b","c","d","e","f","g","h","i","j","k"});
8     }

输出如下：

8 26, 2014 12:57:44 午後 test.Test info
情報: atbecstdefghijb0
8 26, 2014 12:57:44 午後 test.Test error
SEVERE: atbecstdefghijb0
8 26, 2014 12:57:44 午後 test.Test warn
WARNING: atbecstdefghijb0
8 26, 2014 12:57:44 午後 test.Test fatal
SEVERE: atbecstdefghijb0